The range of Worm-Drive Hose clamps consists of 2 styles of clamp. A 9mm band width which has a recommended maximum tightening torque of 3.0Nm and a 12mm band width which has a recommended tightening torque of 5.0Nm. They are solid bands which offer better hose protection than a perforated alternative. It's made from a spot-welded house and the C7 hexagonal head allows standard tools to be used for fitting and removal The AISI 304/W4 version has a stamped rather than perforated band with rolled up edges to avoid hose distortion when clamping a flexible rubber hose